'Prince William in Trooping the Colour Rehearsal' The Duke of Cambridge has carried out the Colonel’s Review at Horse Guards Parade, which acts as a rehearsal for next week's Trooping the Colour marking the Queen's Platinum Jubilee. Around 1500 soldiers of the Household Division and The King's Troop Royal Horse Artillery marched alongside 400 musicians from the Massed Bands on Horse Guards Parade for the second of two formal Reviews ahead of the ceremony in front of the Queen. #TroopingTheColour #PlatinumJubilee #PrinceWilliam Report by Louis Etemadi.